Words) Write a program that determines and prints the number of duplicate words in a sentence. Treat uppercase and lowercase letters the same. Ignore punctuation.

960-Grid-System-master
......................\.gitignore
......................\README.md
......................\app_plugins
......................\...........\fireworks
......................\...........\.........\960.gs Grid Commands.mxp
......................\...........\.........\INSTALL.txt
......................\...........\.........\_source
......................\...........\.........\.......\12 columns.jsf
......................\...........\.........\.......\16 columns.jsf
......................\...........\.........\.......\24 columns.jsf
......................\...........\.........\.......\960.gs Grid Commands.mxi
......................\...........\photoshop
......................\...........\.........\960_GRIDS.atn
......................\...........\.........\INSTALL.txt
......................\code
......................\....\css
......................\....\...\960.css
......................\....\...\960_12_col.css
......................\....\...\960_12_col_rtl.css
......................\....\...\960_16_col.css
......................\....\...\960_16_col_rtl.css
......................\....\...\960_24_col.css
......................\....\...\960_24_col_rtl.css
......................\....\...\960_rtl.css
......................\....\...\demo.css
......................\....\...\min
......................\....\...\...\960.css
......................\....\...\...\960_12_col.css
......................\....\...\...\960_12_col_rtl.css
......................\....\...\...\960_16_col.css
......................\....\...\...\960_16_col_rtl.css
......................\....\...\...\960_24_col.css
......................\....\...\...\960_24_col_rtl.css
......................\....\...\...\960_rtl.css
......................\....\...\...\reset.css
......................\....\...\...\reset_rtl.css
......................\....\...\...\text.css
......................\....\...\...\text_rtl.css
......................\....\...\reset.css
......................\....\...\reset_rtl.css
......................\....\...\text.css
......................\....\...\text_rtl.css
......................\....\demo.html
......................\....\demo_24_col.html
......................\....\demo_24_col_rtl.html
......................\....\demo_rtl.html
......................\....\img
......................\....\...\12_col.gif
......................\....\...\16_col.gif
......................\....\...\24_col.gif
......................\licenses
......................\........\GPL_license.txt
......................\........\MIT_license.txt
......................\logo_files
......................\..........\960_logo.ai
......................\..........\960_logo.eps
......................\..........\960_logo.png
......................\..........\960_logo.psd
......................\..........\LOGO_USAGE.txt
......................\sketch_sheets
......................\.............\960_sketch_12_col.pdf
......................\.............\960_sketch_16_col.pdf
......................\.............\960_sketch_24_col.pdf
......................\.............\960_sketch_all.pdf
......................\templates
......................\.........\acorn
......................\.........\.....\960_grid_12_col.acorn
......................\.........\.....\960_grid_16_col.acorn
......................\.........\.....\960_grid_24_col.acorn
......................\.........\balsamiq
......................\.........\........\960_mockups.bmml
......................\.........\corel_draw
......................\.........\..........\960_grid_12_col.cdt
......................\.........\..........\960_grid_16_col.cdt
......................\.........\..........\960_grid_24_col.cdt
......................\.........\expression_design
......................\.........\.................\960_grid_12_col.design
......................\.........\.................\960_grid_16_col.design
......................\.........\.................\960_grid_24_col.design
......................\.........\fireworks
......................\.........\.........\960_grid_12_col.png
......................\.........\...

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